primary device的用法和樣例：
例句
- If the main device fails, the backup can take over, duplicating all the encryption parameters, that were in force.
如果主設備失靈，備用設備可切換過(guò)來(lái)，將所有有效的加密參數復制下來(lái)。 - The important significance of dynamic response analysis for primary components under accident conditions and the research status at home and abroad were reviewed.
回顧了主設備在事故工況下動(dòng)態(tài)響應分析的重要意義以及國內外研究的現狀。
